检索结果-南通市图书馆

the Adsorbing Effect of Calcined Layered Double Hydroxide for Chloride Ions in Simulated Concrete Pore Solutions

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Wuhan University of technology(Materials Science) 2014年第2期29卷 278-283页

作者：唐聿明 ZHAO Xuhui niu le 左禹 School of Materials Science and Engineering Beijing University of Chemical Technology Beijing Key Laboratory of Electrochemical Process and Technology for Materials

the adsorbing effect of calcined layered double hydroxide （CLDH） for chloride ions in simulated concrete pore （SCP） solutions was investigated with the potentiodynamic polarization method, impedance measurement, ion selective electrode analysis and XRD. CLDH could effectively adsorb Cl^- and increase pH value in SCP solutions containing NaCl. the chloride to hydroxyl ions ratio （[C1^-]/[OH^-]） of the solution greatly decreased by CLDH treatment. In CLDH treated SCP solution with CI-, the pitting potential of carbon steel notably increased, and the surface impedance was much higher, indicating strengthened passivation. the process of CLDH adsorbing chloride ions from SCP solutions was accompanied with the reconstruction of the layered structure.

关键词： pore solution corrosion adsorption chloride calcined layered double hydroxide

Photochemical microfluidic synthesis of vitamin D_3 by improved light sources with photoluminescent substrates

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2021年第1期34卷 204-211页

作者： Wenhao niu Yuanzhi Zheng Ying Li le Du Wei Liu the State Key Laboratory of Chemical Resource Engineering Beijing Key Laboratory of Membrane Science and TechnologyBeijing University of Chemical TechnologyBeijing 100029China

this study presents a novel technique for the controllable preparation of photoluminescent substrates to enhance the photochemical microfluidic synthesis of vitamin D_*** dip-coating method to prepare the substrates was experimentally optimized,and the corresponding emission behaviors were systematically *** substrates were successfully used to enhance the ultraviolet B(UVB) emission of a low-power light source(e.g.,an 8 W lamp),whose UVB emission intensity was increased by approximately 11 *** virtue of the novel light source,the productivity of a single set of photochemical microreactor with a 12-meter-long channel(0.6 mm i.d.) was increased to 1.83 kg·a^(-1),which was 42% higher than that of a 100 W lamp,and no cooling devices were *** method is simple and has great potential to replace traditional medium-pressure mercury lamps for UVB-irradiated photochemical reactions.

关键词： Microfluidics Photochemistry Composites UVB emission Vitamin D_3

Building a More Sustainable Chinese Loess Plateau

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2024年第1期35卷 283-287页

作者： Peiyue Li Xiaomei Kou Yong Wang le niu School of Water and Environment Chang'an UniversityXi'an 710054China Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of the Ministry of Education Chang'an UniversityXi'an 710054China Key Laboratory of Eco-Hydrology and Water Security in Arid and Semi-Arid Regions of the Ministry of Water Resources Chang'an UniversityXi'an 710054China PowerChina Northwest Engineering Corporation Limited Xi'an 710065China PowerChina Sinohydro Bureau 3 Co. LTD.Xi'an 710024China

the Chinese Loess Plateau,a region of remarkable ecological and economic value,grapples with significant water management challenges due to its distinctive geology and *** perspective offers a short review of the eco-environmental protection measures undertaken in the Loess Plateau,underscoring the transformative impacts of initiatives such as the“Grain for Green”***,it also highlights the enduring challenges,including land degradation,water resources issues,socio-economic inequities,and the implications of climate ***,water management emerges as a pivotal issue with far-reaching repercussions for soil conservation,biodiversity,and human *** paper concludes by proposing future actions,emphasizing the necessity for policy modifications,novel initiatives,and research to tackle these challenges and foster sustainable development in the Loess *** insights gained from this region could offer invaluable lessons for other regions confronted with similar challenges,thereby contributing to global efforts to mitigate desertification and champion sustainable development.

关键词： Loess Plateau eco-environmental protection water management sustainable development climate change

Recent Progress in Non-motor Features of Parkinson’s Disease with a Focus on Circadian Rhythm Dysregulation

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2021年第7期37卷 1010-1024页

作者： Yufei Liu Long niu Xinyao Liu Cheng Cheng Weidong le Liaoning Provincial Key Laboratory for Research on the Pathogenic Mechanisms of Neurological Diseases the First Affiliated HospitalDalian Medical UniversityDalian 116021China Liaoning Provincial Center for Clinical Research on Neurological Diseases the First Affiliated HospitalDalian Medical UniversityDalian 116021China Institute of Neurology Sichuan Academy of Medical Science-Sichuan Provincial HospitalUniversity of Electronic Science and Technology of ChinaChengdu 610072China

Parkinson’s disease(PD)is the second most common neurodegenerative disease,which manifests with both motor and non-motor *** rhythm dysregulation,as one of the most challenging non-motor features of PD,usually appears long before obvious motor ***,the dysregulated circadian rhythm has recently been reported to play pivotal roles in PD pathogenesis,and it has emerged as a hot topic in PD *** this review,we briefly introduce the circadian rhythm and circadian rhythm-related genes,and then summarize recent research progress on the altered circadian rhythm in PD,ranging from clinical features to the possible causes of PD-related circadian *** believe that future comprehensive studies on the topic may not only help us to explore the mechanisms of PD,but also shed light on the better management of PD.

关键词： Circadian rhythm dysregulation Circadian rhythm gene Parkinson’s disease REM sleep behavior disorder Dopamine

Hot deformation behavior and processing map of Mg-2Zn-1Al-0.2RE alloy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2020年第6期38卷 665-675页

作者： Yanxia niu Jian Hou Fangkun Ning Xingrui Chen Yonghui Jia Qichi le Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern University.Shenyang 110819China

In this study,uniaxial hot compression tests were carried out between 200 and 400℃ over strain rates of0.001-1 s-1 to investigate the hot deformation behavior of Mg-2 Zn-1 Al-0.2 RE alloy with coarse *** average activation energy was measured to be 174.51 kJ/*** addition,a constitutive relation based on the Arrhenius equation was *** recrystallization(DRX) kinetics were studied by Avrami equation to characterize the evolution of DRX volume *** was favored at high temperatures of 300-400℃ and low strain rates of 0.001-0.01 *** to dynamic material model and Prasad’s instability criterion,a maximum power dissipation of 38% and 32% occurs at 400℃/0.001 s-1 and 400℃/0.01 s-1,*** to the proce ssing map,330-400℃/0.001-0.01 s-1was determined as the optimum deformation parameter range.

关键词： Mg-2Zn-1Al-0.2RE alloy Uniaxial compression Dynamic recrystallization Constitutive relation Processing map Rare earths

Self-assembly of nanoparticles at solid-liquid interface for electrochemical capacitors

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2022年第11期41卷 3591-3611页

作者： Xue Li Chen Chen Qian niu Nian-Wu Li le Yu Bao Wang State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China StateKey Lab of Organic-Inorganic Composites Beijing UniversityofChemicalTechnologyBeijing100029China

Self-assembly of nanoparticles at solid-liquid interface could be promising to realize the assembled functions for various applications,such as rechargeable batteries,supercapacitors,and *** review summarizes the self-assembly of the nanoparticles at solid-liquid interface according to the different driving forces of assembly,including hydrophilic-hydrophobic interactions,solvophobic and electrostatic *** be specific,the self-assembly can be divided into the following two types:surfactant-assisted self-assembly and direct self-assembly of Janus particles(inorganic and amphiphilic copolymer-inorganic Janus nanoparticles).Using the emulsion stabilized by nanoparticles as the template,the self-assembly constructed by the interaction of the nanostructure unit(including metal,metal oxide,and semiconductor,etc.)not only possesses the characteristic of nanostructure unit,but also exhibits the excellent assembly performance in electrochemistry *** application of these assemblies in the area of electrochemical capacitors is ***,the current research progress and perspectives toward the self-assembly of nanoparticles at stabilized solid-liquid interface are proposed.

关键词： Self-assembly Solid-liquid interface Driving force Electrochemical capacitors

Masting promotes transformation from predation to mutualism in an oak-weevil-rodent system

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2024年第7期67卷 1514-1524页

作者： Hongmao Zhang Hongyu niu Michael ASteele Liqing Peng Huimin He Aoqiang Li Xianfeng Yi hongjun Li Zhibin Zhang Institute of Evolution and Ecology School of Life SciencesCentral China Normal UniversityWuhan 430079China State Key Laboratory of Integrated Management of Pest Insects and Rodents in Agriculture Institute of ZoologyChinese Academy of SciencesBeijing 100101China Department of Biology Wilkes UniversityWilkes-Barre 18766USA School of Life Sciences Qufu Normal UniversityQufu 273165China

the significance of ecological non-monotonicity(a function whose first derivative changes signs)in shaping the structure and functions of the ecosystem has recently been recognized,but such studies involving high-order interactions are ***,we have proposed a threetrophic conceptual diagram on interactions among trees,rodents,and insects in mast and non-mast years and tested the hypothesis that oak(Quercus wutaishanica)masting could result in increased mutualism and less predation in an oak-weevil-rodent system in a warm temperate forest of *** 14-year dataset revealed that mast years coincided with a relatively low rodent abundance but a high weevil *** not only benefited seedling recruitment of oaks through increased dispersal by rodents but also a decrease in predation by rodents and weevils,as well as an increase in the overwintering survival of *** appeared to have increased weevil survival by reducing predation of infested acorns by *** results suggest that masting benefits all participants in the plant-insect-rodent system by increasing mutualism and reducing predation behavior(i.e.,a non-monotonic function).Our study highlights the significance of masting in maintaining the diversity and function of the forest ecosystem by facilitating the transformation from predation to mutualism among trophic species.

关键词： antagonism ecological non-monotonicity mutualism seed-weevil-rodent system seedling recruitment rodent overwintering survival weevil survival

Application of dynamic recrystallization model in AZ12 magnesium alloy rolling process

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2023年第2期36卷 325-333页

作者： Yanxia niu Yan SHI Xuelin ZHAO Qichi le Yixuan WANG Shuai REN Na WANG School of Automation Science and Electrical Beihang UniversityBeijing 100191China Department of Musculoskeletal tumor Senior Department of OrthopedicsThe Fourth Medical Center of PLA General HospitalBeijing 10048China Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

to deeply understand the dynamic recrystallization behavior of as-cast AZ12 magnesium alloy in deformation process,the uniaxial hot compression experiments were implemented through systematic isothermal compression *** true strain of thermal compression experiments was set to 50%with temperatures of 200,250,300,350,400℃and the strain rates of 0.001,0.01,0.1,1 s^(-1).the Dynamic Recrystallization(DRX)kinetic model of AZ12 magnesium alloy was established and the accuracy of this model was *** model is used to predict the volume fraction of the sheet obtained by rolling through different rolling passes under the condition of consistent total reduction(50%).And the predicted results are in good agreement with the experimental results.

关键词： AZ12 magnesium alloy Compression DRX model Microstructure Reduction Rolling

Proposing a machine learning approach to analyze and predict basic high-temperature properties of iron ore fines and its factors

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2024年第5期31卷 1082-1094页

作者： Qing-ke Sun Yao-zu Wang Jian-liang Zhang Zheng-jian Liu le-le niu Chang-dong Shan Yun-fei Ma Institute of Artificial Intelligence University of Science and Technology BeijingBeijing100083China School of Intelligence Science and technology University of Science and Technology BeijingBeijing100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China

the basic high-temperature properties of iron ore play a crucial role in optimizing sintering and ore blending,but the testing process for these properties is complex and has significant lag time,which cannot meet the actual needs of ore blending.A prediction model for the basic high-temperature properties of iron ore fines was thus proposed based on a combination of machine learning algorithms and genetic ***,the prediction accuracy of different machine learning models for the basic high-temperature properties of iron ore fines was ***,a random forest model optimized by genetic algorithms was built,further improving the prediction accuracy of the *** test results show that the random forest model optimized by genetic algorithms has the highest prediction accuracy for the lowest assimilation temperature and liquid phase fluidity of iron ore,with a determination coefficient of 0.903 for the lowest assimilation temperature and 0.927 for the liquid phase fluidity after *** trained model meets the fluctuation requirements of on-site testing and has been successfully applied to actual production on site.

关键词： Iron ore Basic high-temperature property Machine learning Random forest Genetic algorithm